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Prayer Time Calculator

Calculates the five prayer times for any coordinates and date, with twelve calculation methods and both asr shadow ratios.

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Enter your figures and press Calculate.
In short Prayer Time Calculator is a free online tool on inputtesthub.com that calculates the five prayer times for any coordinates and date, with twelve calculation methods and both asr shadow ratios. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Prayer Time Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Prayer Time Calculator

The Prayer Time Calculator calculates the five prayer times for any coordinates and date, with twelve calculation methods and both asr shadow ratios. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Checking a local timetable against the underlying astronomy.
  • Getting times for a place with no published timetable.
  • Seeing how much the calculation method changes fajr and isha.

Details

Fajr and ishaSet by a twilight angle, not the sun's position alone
Methods differBy up to 20 minutes
AsrShadow ratio 1 or 2 by school
MaghribAt sunset
Above 48°Summer twilight never ends

The maths behind it

This tool uses the sun's declination and equation of time give solar noon; each prayer is then an hour angle from it — a twilight depression for fajr and isha, a shadow ratio for asr, and the refracted horizon for sunrise and maghrib. Every intermediate value is shown on screen, so the result can be checked by hand.

The geometry here is exact to well under a minute; the convention is the part that varies, which is why the method and the asr ratio are settings rather than defaults this tool is entitled to pick for you. A printed mosque timetable also carries deliberate precaution minutes that no formula reproduces, so use this to check and understand a timetable rather than to replace one.

Where this tool stops

Above roughly 48° latitude the sun does not drop far enough below the horizon in summer for fajr and isha to be defined at all. The tool says so rather than inventing a time. Resolving that is a matter of ruling — nearest latitude, middle of the night, one-seventh of the night — and belongs to your local authority.

Explained in our guides

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Frequently asked questions

Why do prayer time apps disagree with each other?
Because fajr and isha depend on a twilight angle chosen by a calculating authority, and the authorities differ — 15° for ISNA against 19.5° for the Egyptian authority is a gap of twenty minutes or more at the same place on the same day. The astronomy is identical in every app; the convention is not. Pick the method your local mosque uses.
Why is my asr time different from a friend's?
Almost certainly the school. Asr begins when an object's shadow reaches its own length plus the noon shadow in the Shafiʿi, Maliki and Hanbali schools, and twice its length in the Hanafi school. That is typically an hour apart, and both are correct within their own school.
Is the Prayer Time Calculator free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Prayer Time Calculator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
How is the result calculated?
It uses the sun's declination and equation of time give solar noon; each prayer is then an hour angle from it — a twilight depression for fajr and isha, a shadow ratio for asr, and the refracted horizon for sunrise and maghrib. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What problem does the Prayer Time Calculator solve?
The jobs it is built for: checking a local timetable against the underlying astronomy. Getting times for a place with no published timetable. Seeing how much the calculation method changes fajr and isha. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What are the limits of the Prayer Time Calculator?
Above roughly 48° latitude the sun does not drop far enough below the horizon in summer for fajr and isha to be defined at all. The tool says so rather than inventing a time. Resolving that is a matter of ruling — nearest latitude, middle of the night, one-seventh of the night — and belongs to your local authority. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the reference figures here?
Fajr and isha is Set by a twilight angle, not the sun's position alone. Methods differ is By up to 20 minutes. Asr is Shadow ratio 1 or 2 by school. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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